let x = 50
let y = x + 10
let z = x - 8
let m = x * 5
let n = x / 6
let k = x % 6
x = parseFloat(x)
let i = 10
i++
let j = 10
j--
document.write('x的值为：' + x + '<br/>')
document.write('y的值为：' + (x + 10) + '<br/>')
document.write('z的值为：' + (x - 8) + '<br/>')
document.write('m的值为：' + (x * 5) + '<br/>')
document.write('n的值为：' + (x / 6) + '<br/>')
document.write('i++的值为：' + i++ + '<br/>')
document.write('j--的值为：' + j--)